示例说明了一件事:事件不必是输入事件。
One thing the example illustrates is that an event is not necessarily an input event.
最简单规则的例子之一是检查输入事件的字段值。
An example of a simple rule would be a check on the value of a field in an input event.
控制器查看输入事件并将请求分派给某个action类。
The Controller looks at the incoming event and dispatches the request to an Action class. The struts-config.xml.
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